import numpy as np
import pandas as pd
arr=np.random.randint(1,20,size=(3,3))
df=pd.DataFrame(arr)
print(df)
print(df.sort_values(by=1,axis=1))
print((df.sort_values(by=1))
df.coulumns=['a','b','c']
print(df)
print(df.sort_values(by='a',ascending=False))